This chapter is about Java 15 – Record for Sealed Interfaces.
As records are final by default and can extend interfaces. We can define sealed interfaces and let record implement them for better code management.
Example
Consider the following example −
ApiTester.java
public class APITester {
public static void main(String[] args) {
Person employee = new Employee(23, "Robert");
System.out.println(employee.id());
System.out.println(employee.name());
}
}
sealed interface Person permits Employee, Manager {
int id();
String name();
}
record Employee(int id, String name) implements Person {}
record Manager(int id, String name) implements Person {}
Compile and Run the program
$javac -Xlint:preview --enable-preview -source 15 APITester.java $java --enable-preview APITester
Output
23 Robert
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